Results 111 to 120 of about 4,571 (178)

Resistance to pyrethrins.

Bulletin of the World Health Organization, 1998
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Biodegradation of Emerging Contaminants Controlled by Biological and Chemical Factors. [PDF]

Microorganisms
Mqambalala A, Maleke M, Osman JR, Hernandez JC.   +3 more
europepmc   +1 more source

Insecticidal and knockdown resistance status of Anopheles gambiae s.l (Diptera: Culicidae) to pyrethroid and organophosphate insecticides in Osun State, Nigeria. [PDF]

PLoS One
Busari LO, Iwalewa ZO, Surakat OA, Adeogun AO, Rufai AM, Fasasi KA, Adeleke MA.   +6 more
europepmc   +1 more source

Determination of Natural Pyrethrins

Determination of Natural Pyrethrins
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Biosynthesis of the Pyrethrins

Nature, 1961
RECENT work1 has indicated that mevalonic acid (I) is an intermediate in the biosynthesis of terpenoid compounds. We now wish to report some experiments which indicate that this acid is also involved in the biosynthesis of the ‘pyrethrins’, the insecticidal constituents of the pyrethrum plant, Chrysanthemum cinerariaefolium.
M P, CROWLEY, H S, INGLIS, M, SNAREY, E M, THAIN   +3 more
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Chemistry of the Natural Pyrethrins

1961
The flowers of the herbaceous perennial Chrysanthemum cinerariaefolium Vis. (synonym, Pyrethrum cinerariaefolium Trev.), a member of the Compositae family, are valued for their insecticidal properties: the history of their employment has been discussed by Gnadinger (77,78).
L, CROMBIE, M, ELLIOTT
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Poisoning due to Pyrethrins

Toxicological Reviews, 2005
The pyrethrins have a long and fascinating history. They were derived from dried chrysanthemum flower heads that were found to have pesticidal activity centuries ago. They comprise a complex mixture of six main chemicals. Commercial formulations usually contain piperonyl butoxide, which inhibits metabolic degradation of the active ingredients ...
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Oxidative Metabolism of Pyrethrins in Mammals

Nature, 1971
THE natural pyrethrins present in pyrethrum flowers (Chrysanthemum cinerariaefolium) have attracted attention for more than a century because they are powerful insecticides yet have very low toxicity to mammals1,2. Concern about the persistence of some insecticides in mammals and in the environment has stimulated a consideration of the degradability of
J E, Casida, E C, Kimmel, M, Elliott, N F, Janes   +3 more
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Total Synthesis of some Pyrethrins

Nature, 1948
IN view of recent publications in the United States, it is desirable to record briefly some of the results obtained by us during the past year or so. Following the demonstration by LaForge and Barthel1 of the heterogeneity of ‘pyrethrolone', the alcoholic component of the pyrethrins, and the revision by LaForge and Soloway2 of e structures of the ...
L. CROMBIE, M. ELLIOTT, S. H. HARPER, H. W. B. REED   +3 more
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